U.S. defense chief says North Korean troops in Russia, but purpose unclear The Washington PostU.S. Says North Korean Troops Are in Russia to Aid Fight Against Ukraine The New York TimesU.S. Says North Korean Troops Are in Russia and Might Be Used in Ukraine War The Wall Street JournalNorth Korea is sending thousands of soldiers to help Vladimir Putin The EconomistUS says evidence shows North Korea has troops in Russia, possibly for Ukraine war Reuters